Valve-gear.



J. T. WILSON.

VALVE GEAR.

APPLICATION FILED DEO. 11, 1908.

Patented July 30, 1912.

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J. T. WILSON.

VALVE GEAR.

` APPLIOATION FILED DEG.11, 1908. 1,034, 178. Patented July 30, 1912.

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J. T. WILSON.

lVALVE GEAR.

' 1 APPLIOATION FILED DEO. 11l 1908. Patented 30,

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JOHN T. WILSON, OF JERSEY SHORE, PENNSYLVANIA.

VALVE-GEAR.

To all whom it may concern Be it known that I. JOHN T. WILSON, a citizenof the United States, residing at Jersey Shore, in the county ofLycoming` and State of Pennsylvania, have invented new and usefulimprovements in Valve- Gears, of which the following is a specification.

The purpose of the invention is to perfect the well known Stevens gearas disclosed in Letters Patent issued to A. J. Stevens, on November 6,1883, No. 288,133. In practice the oscillating lever, radius bar andvalve rods of the said gear were supported by a link having a pendulousmotion from a fixed pivot. This arrangement allowed the parts to wabbleand failed to maintain the alinement of the radius bar and valve rods,and consequently the gear soon became deranged and partially inoperativeand required frequent inspection and repairs. Furthermore, no supportwas provided for the pivotal connections between the valve rods andvalve stems which still further allowed the sidewise displacement of theparts when motion was being transmitted from the link to the valvestems. By reason of these essential imperfections the gear was removedfrom a large number of locomotive engines to which it had been applied`and its use practically abandoned.

My invention consists broadly in p0sitively supporting the oscillatinglever, radius bar and valve rods at their points of union or where theyare pivotally connected so that the parts will be held in their properrelative positions when reciprocating motion is transmitted from thelink to the valve rods and from the oscillating lever to the said rods.

Still further, the invention consists in the provision of a support forthe pivotally connected ends of the valve rods and valve stems.

Finally, the invention consists in certain novelties of construction andcombinations of parts as hereinafter set forth and claimed.

The accompanying drawings illustrate one complete example of thephysical embodiment of my invention, and a modilica- Speccation ofLetters Patent.

Application led December 11, 1908.

Patented July 30, 1912.

serial No. 467,038.

` tion of the support for the oscillating lever,

radius bar and valve rods, all constructed according to the best mode lhave so far devised for the practical application of the principle. l

Figure 1 is a side view of the main parts of the gear in full lines andof t-he cylinder and' valves in section; Fig. 2 is an enlarged top planview of the part-of the gear shown by Fig. 1 between the steam chest andlink; Fig. 3 shows the oscillating lever detached; Fig. et shows thestand or bracket with the T-headed hanger and forked end of the oscillating lever in section; Fig. 5 is a section on line w-a'w of Fig. 1;Fig. 6 shows the sliding hanger in perspective; Figs. 7, S, 9, 10 and 11illustrate a modified form of movable support for the oscillating leverand connected parts; Figs. 12, 13 and le are side, top plan, and endviews of the back valve guide block; Fig. 15 is a section on line C D ofFig. 12; looking in the direction of the arrow. Fig. 16 is a section online A B of Fig. 12; looking in the direction of the arrow. Figs. 17, 18and 19 are end, side and top plan views of the front valve guide block.

Referring ,to the kseveral figures, the numeral 1 designates aneccentric rod operated in any suitable way by a drivewheel or axle; 2,the link of well known construction; 3, the reach rod; l, the radiusbar; 5, the forked and perforated front en'd of the radius bar; 6, themain rod; 7, the cross head with a downwardly projecting and perforatedbracket; 8, a union link, preferably with forked and perforated ends 9,

way; 18, the horizontallyprojecting arm` l of the bracket; 14, aT-shaped open slot in the arm; 15, a sliding support or hang er; 16, theT-head adapted to fit and slide with- 1 constituting bearings for thesaine.

in the T-shaped slot in the bracket arm; 17, the perforated arms of thesupport or hanger; 18, the bearings for the oscillating leverand forkedend of the radius bar, said bearings being threaded at the ends andscrewed into the threaded perforations in the forked end of said leverand also passed through the perforated arms of the hanger and forkedends of the radius bar; 19, the front valve stem; 20, the back valvestem consisting of a tube Within Which is located the front valve stem;21, a guide stand or bracket of box shape secured by bolts to the frame,the said bracket or stand having side Walls, a removable top cover, andsaid stand being open at the ends and adapted to receive and guidesliding blocks; 9,2, the back valve guide block; Q3, a threaded openingat the end t-o receive the threaded end of the back valve holloiv ortubular stem; 24, a perforated and threaded Web; 25, the back valve rodpivoted as shown at one end to the web Q4; by means of ai threadedbearing stud and at the opposite end to the left hand perforated Wing 11on the front branch of the forked upper end of the oscillating lever;26, the front valve guide block; 27, the perforated and threaded end ofthe block, Within which perforated end is vlocated and secured the endof the front valve stem; Q8, the perforated and threaded web of theblock; and 29 is the front valve rod pivoted at one end to the Web 28 ofthe block 26 by a bearing stud and at the other end to the perforatedyWing 11 on the rear branch of the forked upper end of the oscillatinglever. The number 60 designates the fr'o'nt valve, and 61 the backvalve.

Referring to Figs. 7, S, 9, 10 and 11 which show the modified form ofmovable or sliding support for the oscillating lever, radius bar andvalve rods, 30 designates the stand or bracket; 31-'31, oppositedlydisposed T-shaped slotsat opposite sides'of the bracket; 89,-32,T-shaped slide blocks fitting and movable Within the slots; and 33-33are studs, each threaded at the end, passed through holes in theT-shaped blocks, the `perforations in the forked ends of theoscilla-ting lever, 'and also passed. through the perforated ends of theradius bar and This modified form of support having a sliding block eachside of the forked ends of the oscillating lever and radius barandrarrying the bearing studs very effectively holds the'parts in theirproper relative positions, preventing any displacement and insures aneven Wear 'of the frictional surfaces.

The modus operandi is as follows: Reciprocating motion is transmittedfrom the eccentric rod 1 to the link 2, 'which in turn reciprocates theradius bar 4, the sliding hanger 15, the oscillating lever 9, the valverods 25 and 29, the guide blocks 22 and 2G, and the valve Steins 1S) and20. While the above reciprocating motion is taking place, reciprocatingmotion is transmitted to the lower end of the oscillatinglever 9 by themain rod 6, cross head 7, and union link S. As the back valve rod 25 andfront valve rod Q9 are pivoted to the Wings 11-11 of `the oscillatinglever at points on opposite lsides of its pivots on the sliding support15, said lever when moved in either direction from t-lie position itoccupies in Fig. 1

Will cause the said rods to move in opposite dir-ections, thusaccelerating and retarding the movements of the valves relative to their`seats at certain points of their travel. The

front valve stein obviously moves Within the back valve stein and thefront valve guide block moves Within the back valve guide block underthe action of the oscillating lever.

From the foregoing description taken in connection with the drawing itis clear that I have provided a positive movable support for theoscillating lever, radius bar and valve rods which will maintain theparts in their proper relative positions and prevent any displacementeither sidewise or longitudinally; also that I have provided aneffective guide support for the pivotal ends of the valve stems andvalve rods, Which Will maintain said valve stems and rods in theirproper relative positions. Furthermore, it Will be observed that thelines of force between the valves and the link approximately co-incidewith the substantially horizontal plane Within which the valve stems andvalve rods are located, thus insuring a diminution of friction and theWear of the parts as Well as the saving of power.

1What I claim is:

1. The combination in a valve gear, of a'n oscillating lever adaptedsimultaneously to oscillate about a pivotal center at one end thereofand also to move bodily; two valve rods pivoted to the oscillating leverat different points adjacent to its pivotal center; tivo valve stems inconnection with the valve rods; two valves in operative connection Withthe valve stems; means for connecting the end of the lever opposite itspivotal center end with the cross head so the end of the lever can bereciprocatcd by the movement of said cross head; a bar in operativeconnection with the pivotal oen-- ter end of the oscillating leveradapted to reciprocate t-he lever, valve rods, valve stems and valves;and means consistingof a fixed bearing and a support in bodily movableen gagement With and guided by said fixed bearing and to Which supportthe oscillate ing lever is connected, for holding the pivotal center endof the oscillating lever and the ends of the valve rods connectedthereto so said end of the lever cannot move bodily in a plane at rightangles to the path of the bodily reciprocating movements thereof.

2. The combination in a valve gear, of an oscillating lever adaptedsimultaneously to oscillate about a pivotal center at one end thereofand also to move bodily; two valve rods pivoted to the oscillating leverat different points adjacent. to its pivotal center; two valve stems inconnection with the valve rods; two valves in operative connection withthe valve stems; means for connecting the end of the lever opposite itspivotal center end with the cross head so the end of the lever can bereciprocated by the move ment of said cross head; a bar in operativeconnection with the pivotal center end ci the oscillating lever adaptedto reciprocate the lever, valve rods, valve stems and valves; means formovably supporting the oscillating lever; and means consisting of afixed element and a guiding element in connecA tion with said fixedelement, and also in connection with the valve rods and valve stems, forholding the ends of the valve stems and ends of the valve rods at theiipivotal connections in alinement.

3. The combination in a valve gear, of an oscillating lever adaptedsimultaneously to oscillate about a pivotal center at one end thereofand also to move bodily; two valve rods pivoted to the oscillating leverat different points adjacent to its pivotal center; two valve stems inconnection with the valve rods; two valves in operative connection wit-ht-he valve stems; means for connecting the end of the lever opposite itspivotal center with the main rod so the end of the lever can bereciprocated by said rod; a bar in operative connection with the pivotalcenter end of the oscillating lever adaptedl to reciprocate the lever,valve rods, valve stems and valves; and means for supporting the pivotalcenter end of the'oscillating lever and the ends of t-he valve rodsconnected thereto, consisting of an element fixed to the frame and anelement to which the oscillating lever is pivotally connected in slidingengagement with said fixed element se said end of the lever cannot movebodily at right angles to the path of its bodily reciprocatingmovements.

4. The combination with a frame, of an element ir sliding engagementwith said frame and confined against vertical and sideivise movements; abar and an oscillating lever pivoted to said element, two valve rodspivoted to the pivot-al end of the oscillating lever at opposite sidesof the pivotal point of oscillation, valve stems and valves inconnection with the valve rods; a movable cross head; and means forpivotally connecting the end of the oscillating lever to the cross head.

5. The combination in a valve gear operating substantially as described,of a radiusbar; an oscillating lever with a forked top end; valve rods;and sliding means in connection with the forked top end of the lever forholdin the 4parts in alinement; said valve rods going pivoted to theoscil* lating lever at opposite sides of the longitudinal 'axis of thelever whereby said rods may have rocking movements.

6. The combination in a valve gear, of a radius bar with a forked end;an oscillating lever with a forked end; valve rods pivoted to theoscillating lever at opposite sides of the longitudinal axis of saidlever; and means for movably supporting the bar, lever and rods.

7. The combination in a valve gear, of` a radius bar with a forked end;an oscillating lever with a forked end; valve rods pivoted to theoscillating lever; a support with a T-slot; and a hanger having a T-headlocated within the said slot.

8. The combination with a cylinder having a steam chest with two seatsand two independently movable valves, of two valve stems each separatelyconnected to a valve; two valve rods located side by side and connectedto the valve stems; an oscillating and bodily movable lever to which theends of the valve rods are pivoted; means for oscillating the lever; abar adapted to move the lever bodily; a support; and means to which theoscillating lever and bar are pivoted in engagement with and having asliding movement relative to the said support., whereby the said bar,oscillating lever, and valve rods are held in alinement.

9. The combination in a valve gear, of a radius bar; an oscillatinglever; valve rods; valve stems with which the valve rods have pivotalconnections; and means for supporting the valve rods and stems at theirpoints of connection and confining them so they cannot move in a planeat right angles to their paths of reciprocating motion.

10. The combination in a valve gear, of

a radius bar; an oscillating lever; valve rods; valve stems with whichthe valve rods have pivotal connections; a guiding element suitablysupported; and sliding means in connection with the guiding element `andY 12. The combination in a valve gear, of

two valve stems one located and movable within the other; two blocks onemovable forations being at opposite sides of the 1011 10 within theother and to which the valve gitudinal axis of the lever.

stems are secured; two valve rods pivoted In testimony whereof I aiiixmy signature to the blocks; and means with which the in presence of twowitnesses.

blocks are in sliding engagement for guidr i i T ing the b1 Ocks- JOHNl. WILbOh.

13. An oscillating lever having one end Witnesses: forked and eachbranch provided with a WV. BRUCE HABLAN, perforation intermediate itsends, said per- JNO P. STEVENS.

Copies olf this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

